we were recently hit by the update that subsequently blocked internet access.... we were able to download the installer from the web site, but the installer itself needs access to the internet.... our ISP won't allow that without anti-virus software -- so we're stuck!!!!!

is there a download of a "complete" image -- what you'd find on a CD???

Does installing malwarebytes allow you access? During mcafee install you can ask to remove malwarebytes and mcafee will do that for you. Maybe this will trick the isp into allowing access. You can download the setup file to a stick and run it from it.